12-21. Farmers consider uniformity of yield to be an important attribute of an agricultural commodity. Two types of seed (brands X and Y) for growing alfalfa are to be compared. They have about the same mean yield/acre but it was determined for nX = nY = 15 that s2X

= 15 (bushels)2 and s2Y

= 22 (bushels)2. Is the variance of brand X significantly lower than the variance of brand Y? Use α = 0.10.